Whataburger is celebrating 70 years and today is the last day you can take full advantage of the birthday present they're offering customers.
Whataburger's buy one get one free expires today.
You have to get the barcode at their app and order online.
The burger chain now based in San Antonio got its start in Corpus Christi, where founder Harmon Dobson opened the first store in 1950.
The chain plans to open dozens of new stores between now and the end of 2021, including an expansion for the first time into Kansas, Missouri and Tennessee.
photo: getty images